Feasibility Study of Applying Chaotic Carrier Frequency Modulation in Switching-mode Power Supply

摘要

Owing to the pseudo-randomness and the continuous spectrum features of chaos, chaotic carrier frequency modulation (CCFM) technique can be well employed to fight electromagnetic interference (EMI) of switching mode power supplies (SMPS) by spreading the spectra of input and output signals over the entire frequency band. EMI test, output voltage ripple measurement and efficiency measurement have been conducted on the chaos-control SMPSs, leaving the influence of chaos control on the whole system performance to be further investigated. In order to investigate the feasibility of applying CCFM in SMPS, the tests on the electrical characteristic, working condition and EMC performance of SMPS are carried out, and the experiments are conducted to verify that the application of the chaotic modulation in SMPS can reduce EMI without weakening the system performance.